CN218513668U - UHF 3-path PCB power combiner - Google Patents
UHF 3-path PCB power combiner Download PDFInfo
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- CN218513668U CN218513668U CN202222413329.3U CN202222413329U CN218513668U CN 218513668 U CN218513668 U CN 218513668U CN 202222413329 U CN202222413329 U CN 202222413329U CN 218513668 U CN218513668 U CN 218513668U
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- 239000002184 metal Substances 0.000 claims abstract description 64
- 230000008878 coupling Effects 0.000 claims abstract description 61
- 238000010168 coupling process Methods 0.000 claims abstract description 61
- 238000005859 coupling reaction Methods 0.000 claims abstract description 61
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims description 17
- 239000000725 suspension Substances 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a UHF 3-path PCB power combiner, which comprises a metal cavity, a PCB arranged in the metal cavity, three input ports arranged on the metal cavity and an output port arranged on the metal cavity; the PCB is provided with a 3dB coupler and a 4.8dB coupler, the 3dB coupler is formed by microstrip coupling lines, the 4.8dB coupler is formed by microstrip coupling lines, the 3dB coupler and the 4.8dB coupler are cascaded to obtain three input ports and one output port, and the three input ports and the output port are respectively connected with the three input ports and the output port through transmission lines.
Description
Technical Field
The utility model belongs to electronic information/radio frequency/high-power passive device field, concretely relates to UHF 3 way PCB board power combiner.
Background
The three-in-one power synthesizer used in the UHF transmitter is a common passive device, and is used for synthesizing three paths of same signals to one port for outputting, thereby completing the function of power synthesis. This is accomplished by cascading a 3db coupler and a 4.8db coupler, commonly referred to as a chain synthesizer.
As shown in fig. 1, the UHF chain type three-way combiner is formed by connecting 1 3db coupler and 1 4.8db coupler, the internal electromagnetic coupling of the single 3db coupler and the 4.8db coupler for forming the three-way combiner is realized by microstrip line coupling, and the basic coupling structure thereof is shown in fig. 2.
A single-section 3-decibel coupler can distribute one path of signal into two paths of signals with equal power, and the coupler is provided with 4 ports which are an input end, a straight-through end, a coupling end and an isolation end. For an ideal 3dB coupler, the isolation end has no output, the output power of the direct connection end and the coupling end is half of the input power, and the phase of the output signal of the direct connection end lags the phase of the output signal of the coupling end by 90 degrees.
The single-section 4.8-decibel coupler can distribute one path of signals into two paths of signals with the power ratio of 2, and the coupler is provided with 4 ports which are respectively an input end, a straight-through end, a coupling end and an isolation end. For an ideal 4.8dB coupler, the isolation end has no output, the output power of the straight-through end and the coupling end is 2/3 and 1/3 of the input power respectively, and the phase of the output signal of the straight-through end lags the phase of the output signal of the coupling end by 90 degrees.
The 3db coupler can also be used as a power combiner, and the two electric signals with equal power and 90 ° phase difference are input from two mutually isolated ports, and can be combined together and output from one port, thereby completing the effect of power combination. The 4.8db coupler can also be used as a power combiner, and electrical signals with a power ratio of 2.
Traditionally, UHF synthesizers have a frequency range of 470MHz to 702MHz. The chain type three-way power synthesizer for the UHF transmitter in the current market is mostly in a suspension strip line structure, and the volume and the weight are both larger. The traditional synthesizer with the suspended strip line structure has higher processing cost and complex assembly, is not suitable for mass production, and is inconvenient to freely adjust the internal structure according to the requirements of appearance, port layout and the like.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: for the processing cost height that solves current UHF three routes synthesizer existence, assemble complicacy, inconvenient freely adjust inner structure, volume weight all great problem, the utility model provides a UHF 3 way PCB board power combiner.
The technical scheme is as follows: a UHF 3-path PCB power combiner comprises a metal cavity, a PCB placed in the metal cavity, three input ports arranged on the metal cavity and an output port arranged on the metal cavity; be equipped with 3 decibel couplers and 4.8 decibel couplers on the PCB board, 3 decibel couplers comprise microstrip coupling line, 4.8 decibel couplers comprise microstrip coupling line, and 3 decibel couplers and 4.8 decibel couplers obtain three input ports and an delivery outlet after cascading, and three input ports and a delivery outlet pass through the transmission line and are connected with three input port and an output port respectively.
Furthermore, the microstrip coupling line is a 1/4 wavelength microstrip coupling line.
Furthermore, the microstrip coupling line is a coupling metal strip, and the coupling metal strip is arranged on the PCB.
Furthermore, three input ports are located on the same plane, the three input ports are directed to the same direction, and the axis of one output port is parallel to and opposite to the axis of the input port.
Further, the transmission line is a transmission line having a characteristic impedance of 50 ohms.
Furthermore, the device also comprises two absorption resistors, wherein the absorption resistors are arranged on the metal cavity, and the two absorption resistors are respectively connected with the isolation end of the 3dB coupler and the isolation end of the 4.8dB coupler.
Furthermore, the microstrip coupling line structure also comprises a metal shielding cover and a suspension metal strip, wherein the metal shielding cover is fixed above the microstrip coupling line; the suspension metal strip is fixed below the microstrip coupling line.
Furthermore, a plurality of rib-shaped radiating fins are arranged outside the metal cavity.
Further, the device also comprises a forward weak directional coupler, wherein the forward weak directional coupler is arranged at the output port and used for monitoring the forward output power.
Further, the device also comprises a reverse weak directional coupler which is arranged at the output port and used for monitoring reverse output power.
Has the beneficial effects that: compared with the prior art, the utility model, have following advantage:
(1) The utility model utilizes the coupling metal belt on the PCB board for coupling, and has obvious advantages in appearance volume, weight, port layout and the like compared with the suspension strip line;
(2) The utility model can conveniently change the appearance and the port spacing of the coupler by adjusting the transmission line direction and the length size at the tail end of the coupling metal belt;
(3) The utility model can satisfy the requirements of transmitter manufacturers on the appearance, port layout and other aspects of a 3-path synthesizer, and can also satisfy the requirements on electrical indexes such as synthesizer power capacity, port reflection loss, isolation and the like by reasonably adjusting the arrangement and the size of the internal microstrip circuit; the customized requirements of a transmitter manufacturer on the input port distance of 89mm (2U) and the synthesizer depth of less than 160mm can be met, the reflection loss of UHF (470 MHz-702 MHz) in a band is more than 21 decibels, the amplitude meets 4.8 +/-0.4 decibels, the fluctuation of phase difference is within +/-6 degrees, and the isolation between the input ports is more than 25 decibels;
(4) The outer cavity of the utility model is processed into the shape of the rib radiating fin, so as to achieve the purpose of improving the radiating effect and better reduce the temperature of the synthesizer;
(5) The utility model has the advantages of compact overall structure, integrated nature are good, easily installation, small, light in weight, processing cost are lower, the volume production of being convenient for etc.
Drawings
FIG. 1 is a schematic diagram of a three-way power combiner;
FIG. 2 is a schematic diagram of an output port structure of a UHF 3-path PCB power combiner;
FIG. 3 is a schematic diagram of an input port structure of a UHF 3-path PCB power combiner;
FIG. 4 is a schematic diagram of a heat sink cavity of a UHF 3-way PCB power combiner;
FIG. 5 is a schematic diagram of a heat sink cavity of a UHF 3-way PCB power combiner;
FIG. 6 is a schematic diagram of a heat sink cavity of a UHF 3-way PCB power combiner;
fig. 7 is a schematic front view of a three-way power combiner with a PCB mounted thereon;
fig. 8 is a schematic front view of a three-way power combiner PCB board;
fig. 9 is a schematic diagram of a back side of a three-way power combiner PCB board;
fig. 10 is a schematic diagram of the relationship of microstrip coupling lines on a PCB.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
Example 1:
this embodiment is based on the three-way power combiner principle shown in fig. 1, and realizes three-way power combining through a transmission line, a single-section 3db coupler and a 4.8db coupler. Specifically, the power combiner of this embodiment mainly includes a metal cavity, a PCB placed in the metal cavity, three input ports disposed on the metal cavity, and an output port disposed on the metal cavity, where a circuit structure of 1 3db coupler and a circuit structure of 1 4.8db coupler are disposed on the PCB, and the 3db couplers and the 4.8db couplers are combined in a cascade manner.
The three-way power synthesizer of the present embodiment is applied to a 470MHz-702MHz band, and the circuit structures of the 3db coupler and the 4.8db coupler used in the present embodiment are microstrip circuits, that is, they are formed by coupling metal strips. The embodiment changes a common suspended strip coupling line structure in the traditional power synthesizer, the circuit structure of a single-section 3dB coupler is realized by coupling metal strips which are arranged in parallel, the circuit structure of a 4.8dB coupler is realized by the coupling metal strips which are arranged in parallel, and the coupling metal strips are arranged on a PCB (printed circuit board) so as to meet the requirements of small size, light weight and flexible port layout. The central frequency of the 470MHz-702MHz wave band is 586MHz, in order to ensure the phase difference between the coupling end and the through end is 90 degrees, the microstrip coupling line with the length of 1/4 wavelength of the coupling metal band is coupled.
In order to meet the position requirement and the phase requirement of the input and output ports (the axial lines of the output port and the 3 input ports are respectively 203.9mm, 51.5mm, 140.5mm and 229.5mm away from the side edge of the cavity, the phase from the 3 input ports to the output port is 0 degree/90 degrees), the input and output ports are additionally connected with transmission lines for adjusting the position and the phase of the ports, namely the transmission lines are additionally connected at the tail ends of the coupling metal strips, and the transmission lines of the embodiment are transmission lines with a specific length and 50 ohms of characteristic impedance.
In order to ensure that the three-way combiner of this embodiment can be conveniently connected to the power amplification module of the transmitter, three input ports of the three-way combiner are located on the same plane, the three input ports are directed to the same direction, and the distance between the ports is 89mm (2U).
For convenience of connection, the axis of the output port of the three-way combiner is parallel to and opposite to the axis of the input port, namely, the signal is output from the opposite side of the input port of the combiner. The output port of the present embodiment is a DIN 7/16 (F) coaxial port.
In order to ensure that the three-way synthesizer can occupy as little depth space as possible after being connected with a power amplification module of a transmitter, the size of the synthesizer in the depth direction of a cabinet is required to be less than 160mm.
In order to improve the synthesis efficiency of the three-way synthesizer, the phase deviation fluctuation value of the input port of the 4.8dB coupler in the three-way synthesizer between 470MHz and 702MHz is required to be less than +/-10 degrees.
In the single-section 3dB coupler of the present embodiment, after simulation debugging, the isolation in the frequency band (470 MHz-702 MHz) is greater than 30 dB, the port reflection loss is greater than 26.5dB, and the coupling degree is 3 ± 0.3 dB.
In the single-section 4.8-dB coupler of the embodiment, after simulation debugging, the isolation degrees in the frequency band (470 MHz-702 MHz) are all greater than 30 dB, the port reflection losses are all greater than 26.5dB, and the coupling degree is 4.8 ± 0.3 dB.
In the embodiment, the appearance and the port spacing of the coupler can be conveniently changed by matching and adjusting the direction and the length dimension of the transmission line at the tail end of the coupling metal strip.
By reasonably adjusting the arrangement and the size of the internal microstrip circuit, the requirements of transmitter manufacturers on the aspects of the appearance, the port layout and the like of the 3-path synthesizer can be met, and meanwhile, the requirements on electrical indexes such as the power capacity, the port reflection loss, the isolation and the like of the synthesizer can also be met. Tests show that the three-way synthesizer of the embodiment has port reflection loss larger than 21 dB, isolation between ports larger than 27 dB and amplitude of 4.8 +/-0.4 dB in a use frequency band, and completely meets the use requirements of transmitter manufacturers.
Example 2:
referring to fig. 2 to 5, the power combiner of the present embodiment mainly includes a metal cavity 1, a PCB disposed IN the metal cavity 1, three input ports (denoted as IN1, IN2, and IN 3) disposed on the metal cavity 1, one output port OUT disposed on the metal cavity 1, and two absorption resistors (denoted as R1 and R2) mounted on the metal cavity 1; the PCB is provided with a circuit structure of 1 3dB Coupler and a circuit structure of 1 4.8dB Coupler, and the two absorption resistors are respectively connected with the isolation end of the 3dB Coupler and the isolation end of the 4.8dB Coupler. The whole PCB is fixed in the metal cavity 1 through screws.
The circuit structure of the 3db coupler and the circuit structure of the 4.8db coupler of the present embodiment both form a microstrip circuit through the coupling metal strip 2 on the PCB board, so as to meet the requirements of small size, light weight and flexible port layout.
Referring to fig. 7 to 9, in the present embodiment, a metal shielding cover 7 is disposed on the front surface of the PCB, and the metal shielding cover 7 is fixed above the coupling metal strip 2 for adjusting the index of the optimized coupler. The embodiment is provided with a suspension metal strip 8 on the back of the PCB board, and the suspension metal strip 8 is fixed below the coupling metal strip 2 for increasing the electromagnetic coupling of the coupling metal strip 2 on the front of the PCB board. Fig. 10 shows the position relationship between the coupling metal lines and the floating metal strips 8, where H is the thickness of the dielectric layer of the PCB, W is the width of the front coupling metal lines, S is the distance between the coupling metal lines, wf is the width of the floating metal strips, and Sg is the distance between the floating metal strips and the ground plane beside.
The 3db coupler and the 4.8db coupler are combined in a cascade, three input ports are located on the same plane, the three input ports point to the same direction, the distance between the ports is 89mm (2U), the axial lines of the three input ports are respectively 51.5mm, 140.5mm and 229.5mm away from the side of the cavity, and the phases from the 3 input ports to the output ports are respectively 0 °, -90 °. The axes of the output ports of the three-way synthesizer are parallel and opposite to the axes of the input ports, namely, signals are output from the opposite side of the input ports of the synthesizer, and the axes of the output ports are 203.9mm away from the side edge of the cavity respectively.
The three-way power synthesizer of the embodiment is applied to a 470MHz-702MHz wave band, the center frequency of the 470MHz-702MHz wave band is 586MHz, in order to ensure that the phase difference between the coupling end of a single-section 3dB coupler and the coupling end of a 4.8dB coupler and the respective straight-through end is 90 degrees, a microstrip coupling line with the length of a coupling metal strip 2 being 1/4 wavelength.
In order to meet the position requirement and the phase requirement of the input/output port, the transmission line 3 for adjusting the position and the phase of the port is additionally connected to each input/output port, that is, the transmission line 3 is additionally connected to the tail end of the coupling metal strip 2, and the transmission line of the embodiment is a transmission line with a specific length and a characteristic impedance of 50 ohms.
The design method adopted by the embodiment can flexibly adjust the space between 3 input ports and the overall dimension of the whole synthesizer according to the requirement, can meet the customization requirement of a transmitter manufacturer on the space between 89mm (2U) of the input ports and the depth of the synthesizer being less than 160mm, and other electrical indexes also meet the use requirement of power synthesis. And the design method adopted by the embodiment can be used for designing three-way power combiners with other port spacing and size requirements.
The reflection loss of the three-way power synthesizer of the embodiment at the internal UHF (470 MHz-702 MHz) is larger than 21 decibels, the amplitude meets 4.8 +/-0.4 decibels, the fluctuation of the phase difference is within +/-6 degrees, and the isolation between input ports is larger than 25 decibels. The integrated type LED lamp has the advantages of compact integral structure, good integration, easiness in installation, small volume, light weight, lower processing cost, convenience in mass production and the like.
Example 3:
referring to fig. 6, in order to ensure the heat dissipation effect of the synthesizer, in this embodiment, on the basis of embodiment 2, the shape of the cavity of the synthesizer is processed into the shape of a rib-shaped heat dissipation fin 6, so as to improve the heat dissipation effect and better reduce the temperature of the synthesizer.
Example 4:
referring to fig. 7, in this embodiment, on the basis of embodiment 2, a forward weak directional coupler 4 and a reverse weak directional coupler 5 are added at an output port, and the forward weak directional coupler 4 and the reverse weak directional coupler 5 are used for monitoring forward and reverse output power, and the coupling degree can be adjusted by a pi-type attenuator.
Claims (10)
1. A UHF 3 way PCB board power combiner which characterized in that: the PCB comprises a metal cavity, a PCB arranged in the metal cavity, three input ports arranged on the metal cavity and an output port arranged on the metal cavity; be equipped with 3 decibel couplers and 4.8 decibel couplers on the PCB board, 3 decibel couplers comprise microstrip coupling line, 4.8 decibel couplers comprise microstrip coupling line, and 3 decibel couplers and 4.8 decibel couplers obtain three input ports and an delivery outlet after cascading, and three input ports and a delivery outlet pass through the transmission line and are connected with three input port and an output port respectively.
2. The UHF 3-way PCB board power combiner of claim 1, wherein: the microstrip coupling line is a microstrip coupling line with 1/4 wavelength.
3. The UHF 3-way PCB board power combiner of claim 1 or 2, wherein: the microstrip coupling line is a coupling metal strip, and the coupling metal strip is arranged on the PCB.
4. The UHF 3-way PCB power combiner of claim 1, wherein: the three input ports are positioned on the same plane, the three input ports are directed to the same direction, and the axis of one output port is parallel to and opposite to the axis of the input port.
5. The UHF 3-way PCB board power combiner of claim 1, wherein: the transmission line is a transmission line having a characteristic impedance of 50 ohms.
6. The UHF 3-way PCB power combiner of claim 1, wherein: the metal cavity is provided with two absorption resistors, wherein the two absorption resistors are arranged on the metal cavity and are respectively connected with the isolation end of the 3dB coupler and the isolation end of the 4.8dB coupler.
7. The UHF 3-way PCB power combiner of claim 1, wherein: the microstrip coupling line structure further comprises a metal shielding cover and a suspension metal belt, wherein the metal shielding cover is fixed above the microstrip coupling line; the suspension metal strip is fixed below the microstrip coupling line.
8. The UHF 3-way PCB power combiner of claim 1, wherein: and a plurality of rib-shaped radiating fins are arranged outside the metal cavity.
9. The UHF 3-way PCB power combiner of claim 1, wherein: the power amplifier further comprises a forward weak directional coupler, wherein the forward weak directional coupler is arranged at the output port and used for monitoring the forward output power.
10. The UHF 3-way PCB power combiner of claim 1, wherein: the reverse weak directional coupler is arranged at the output port and used for monitoring reverse output power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222413329.3U CN218513668U (en) | 2022-09-13 | 2022-09-13 | UHF 3-path PCB power combiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222413329.3U CN218513668U (en) | 2022-09-13 | 2022-09-13 | UHF 3-path PCB power combiner |
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| Publication Number | Publication Date |
|---|---|
| CN218513668U true CN218513668U (en) | 2023-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222413329.3U Active CN218513668U (en) | 2022-09-13 | 2022-09-13 | UHF 3-path PCB power combiner |
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| CN (1) | CN218513668U (en) |
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Effective date of registration: 20231124 Address after: 610095 No. 1, floor 17, building 10, No. 399, west section of Fucheng Avenue, Chengdu hi tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan Patentee after: Chengdu deshihe Communication Technology Co.,Ltd. Address before: No. 38, Dingmao Panzong Road, Zhenjiang New District, Jiangsu Province, 212009 Patentee before: JIANGSU DESHIHE COMMUNICATION TECHNOLOGY CO.,LTD. |
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